Dynamo-electric machine.



W. J. FOSTER.

DYNAHO ELECTRIC MACHINE.

urmcnmn FILED OUT. 13, 1905.

1,064,310, Patented June 10, 1913.

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DYNAMO ELECTRIC MACHINE.

#PILIOATION FILED OCT. 13, 1905.

Patented June 10, 1913.

2 SHEETS-SHEET 2.

UNITED STATES PATENT ormon.

LIAM J. FOSTER, OF SCHENECTADY, NEW YORK, ASSIGNOR T0 GENERAL ELECTRICCOMPANY, A CORPORATION OF NEW YORK.

DYNAMO-ELECTRIC MACHINE.

Specification of Letters Patent.

Patented June 10, 191 3.

To all whom it may concern:

Be it known that I, \VILLIAM J. FOSTER, a citizen of the United States,residing at Schenectady, county of Schenectady, and State of New York,have invented certain new and useful Improvements in Dynamo- ElectricMachines, of which the following is a specification.

The object of my invention is generally to simplify and improve theconstruction of dynamo electric machines, and particularly to provide aconstruction of the rotating member of such a machine suitable foroperation at high rotative speeds.

In the embodiment of my invention which I have hereinafter illustratedand described, the rotating member of the machine is of the so-calledsmooth core type and is so constructed that it may be readily balancedand will not become unbalanced or otherwise injured by the stresses setup by its rotation at speeds such as are experienced with dynamoelectric machines driven by steam turbines.

The various features of novelty which characterize my invention arepointed out with particularity in the claims annexed to and forming apartof this specification. For a better understanding of my invention,however, reference may be had to the accompanying drawings anddescriptive matter in which I have illustrated and described embodimentsof my invention.

-.Of the drawings, Figure 1 is an elevation with parts broken away andin section of a four-pole dynamo electric machine; Fig. 2 18 an endelevation with parts broken away and in section of the rotor of themachine shown in Fig. 1; Fig. 3 is a sectional elevation on the line 33,of Fig. 2; Fig. i is a I sectional elevation illustrating a modifieddetail of construction; and Fig. 5 is an elevation of the end of therotor of a six-pole machine.

In the drawings, 1 represents a base or support on which is mounted thestationary frameniember 2 of a four-pole internal revolving fieldalternating current generator. The supporting member 1 in the particularmachine illustrated is intended to be mounted upon the upper end of avertical shaft steam turbine, the turbine shaft in such case beingdirectly connected to and in alinement with the shaft 3 on the rotor ofthe dynamo electric machine. I

The shaft 8'has keyed to it a shell or sleeve 4. The sleeve 4 isprovided at one end with an integral flange or end member comp'ris ing aradial web portion 6 and a flange portion 7 at right angles to the webportion 6. The flange portion 7 in the construction illustrated isrectangular as viewed from the end, the arrangement and constructionbeing such that the flange 7 and web portion (3 resemble the sides andends of a rectangular box. The core proper of the rotor formed oflaminae S which are HSSQD'llJlCCl in sections 9 on the sleeve 4 to whichthey are keyed, the laminae in each section being riveted to-- gether.The sections are separated by suitable spacers in order to form radiallyextending ventilating passages 10. The sec tions 9, are clamped betweenthe end member 5 andia similar end member. 5 separable from the sleeve4, comprising a web portion 6 and a flange portion 7 by means of a nut11 threaded on the sleeve 4. As shown the laminae are formed Withregistering openings in them which combine to form axially extendingventilating passages 12. Suitable openings 13 communicating with thepassages 12 are formed in the end members 5 and 5'.

In the particular construction described, each lamina is formed withfour similar symmetrically disposed sets of coil receiving openings.These openings in the laminae register to form four sets of axiallyextending slots. Each set of openings comprises one inner pair of slots14 and one outer pair of slots 15. The inner or bottom walls of theslots in each set all terminate in the same plane with the outer surfaceof the corresponding parts of the flange members 7 and 7. The side wallsof the slots in each set are parallel. By reason of the curvature of theouter surface of the core, however, the inner slots of each set aredeeper than'the outer slots. The windings for the rotor are divided intogroups or sets, one group for each pole. Each groupcomprises, in theform shown, two coils 16 and 17 which are preferably form wound. Eachcoil 16 is received in one of the inner pairs of slots 14' and thecorresponding coil 17 in the adjacent pair of slots 15. Asshown, theslots may be formed to receive and hold against radial movement suitablecoil retaining keys 18. a l

The end turns of the coils of each group the coils are assembled and theretaining keys 18 are put in place the segment shaped members areclamped up against the outer edges of the end turns or connections ofthe coils. If found desirable or necessary in particular cases, rings orhands 21, one at each end of the core formed ofsuitable material havinghigh tensile strength, such as nickel steel, may. then be shrunk tightlyabout the members 20. If necessary, the members 20 may be first turnedafter being secured, in place in order that their outer surfaces maybetruly concentric; The heads of the bolts are received in recesses formedin the members 20 so that they do not interfer-e with the rings 21 orthe turning operation referred to.

Apertured end cover members 22 are secured to the flange portions 7 and7 with. whichthey may have a tongue and groove connection as shown, bybolts 23. The inner edges of'the end cover members 22 are flush with theinner surfaces of the flange portions 7 and '7'. The outer periphery ofeach member22 is flush with the outer periphery of the adjacent ring orband 21 and is substantially flush with the outer periphery of the body,of the core against the ends of which it will be observedthe rings orhands 21 engage. Suitable space blocks24c, 25 and 26, which may beformed of wood, may be placed between the core, and the coil 16,'be-

tween the two coils, and between the coils 17 and the end member 22,respectively, Each end cover member 22 is formed at its outer peripherywith axially extending cylindrical flange portions 27 from the edge ofwhich remote from the core, a web 28 extends. inwardly. This results inthe formation of the annular groove 28 at the outer periphery of the endmember in which any necessary balancing weights 29 of any desiredconstruction may be quickly and reliably secured. The balancing weightsthus placed do not create undesirable windage'by reason of theprotection given by the flange or web 28.

The principal functions of the end cover members aside from forming acarrier for the balancing weights are to protect the coils frommechanical injury and to cut down undesirable windage of the machine.hen the rings or hands 21 are employed the bolts 1.9 may be permanentlyretained in place or they may be withdrawn through openings 21 formed inthe rings or bands, see Fig. at.

' In this case the bolt holes form radially extending ventilatingpassages through which air set in motion by'the motion of themachine.)asses and cools the end connections of the coils. It will of course beunderstood that the air passing through the various ventilating passagesof the rotorserves to cool not only the rotor core and the windings butthe core and windings of the stator surroum'ling the rotor.

The construction illustrated and described is simple, compact and iswell adapted to withstand the stresses created when the machine isoperated at the rotative high speeds experienced in practice. By reasonof the simplicity and symmetry of the construction little difficulty isexperienced in balancing the rotor.

Arranging the bottom walls of the slots parallelism of the side walls ofthe slots the insertion of the coils in their slots or their removal isfacilitated. Q

It will be obvious to those skilled in the art that changes may be madein the form of my invention disclosed without departing from its spirit,and that some features of m invention may be employed withoutthe use ofothers.

It will of course be clearthat the invention is not limited to use" in afour-pole motor, but could 'be advantageously employed in amachinehaving a different num ber of poles. In Fig. 5 I have shown aconstruction in which the invention is employed in a six-pole machine.In this" embodiment of my invention the flange portions 7 of the end"members against which the inner edges of the end of the coils restarehex:

agonal. WVhat I claim as new and desire to secure by Letters Patent ofthe United States, is,-

1. In a dynamo-electric machine, a multipolar field magnet comprising acore and a plurality of coils per pole contained in coil receivingslots-formed in the magnet core and arranged parallel with the axis ofthe pole, the bottom of the slots for each pole terminating in the sameplane.

2. In a dynamo-electric machine, a multipolar field magnet comprising acore, a plurality of coils per pole contained 1n'co1l receivingslotsformed in the magnetv core, the

bottoms of the slots for each pole terminating inthe same plane, and anend member having coil supporting surfaces in'the same plane with thebottoms of said slots.

3. A'field magnet for a dynamo-electric machine comprising a core and aplurality of coils per pole contained in coil receiving slots formed inthe magnet qire, the sides 01 the slots for each pole beingparallel andtheir bottom walls terminating in the same plane.

et. A multipolar field magnet comprising a core, a plurality of coilsper pole contained in coil receiving slots formed in said core, thesides of the slots for each pole beingparallel and their bottom wallsterminating in the same plane, and an end member having a supportingsurface in the same plane with the bottom walls of the slots for eachpole.

5. In the rotating member of a dynamo electric machine, a. core,windings therefor, portions of which project beyond the ends of thecore, a plurality of members engaging the outer surfaces of themrtions'of the winding projecting by one end of the core, means forindependently forcing each of said members radially inward against thewinding, and a shrink ring for permanently holding said members inplace.-

'6. In the rotating member of a dynamo electric machine, a core,windings therefor, portions of which project by the end of the core,'endmembers for the core having a surface extending in the direction of theaxis of the core against which the inner surface of said projectingwinding portions rest, a

plurality of members for engaging the outer surfaces of the portions ofthe wimliugs projecting by one end of (the core, means for independentlysecuring each of said members to the adjacent end member, and a shrinkring for permanently holding said members in place.

.windings projecting by one end of the core,

means for independently securing each of said members to the adjacentend member,

and an annular member surrounding said plurality of members to hold themin place.

8. In a dynamo electric machine, a slotted core, windings located in theslots of said core arranged in sets with one winding in each setsurrounding another winding in said set, supporting devices for the endsof said windings engaging their inner and outer surfaces, and means forsecuring said supporting devices in position comprising a bolt or boltsextending between the windings of a set.

9. In a dynamo electric machine, a slotted core, windings located in theslots of said core and arranged in sets with. one winding in each setsurrounding another winding in said set, the ends of said windings beingspaced apart, a support for the ends of the windings engaging theirinner surfaces and another support for the ends of the windings engagingtheir outer surfaces, and means passing through the spaces between saidwindings for securing the supports together.

' 10. In a dynamo electric machine, a multipolar field magnet having aplurality of windings for each pole, the inner edges of the windings foreach pole being in the same plane and their outer edges being indifferent planes, and a retaining device engaging the ends of thewindings, said retaining device being formed with separatesurfaces onefor each winding which bear against the outer surfaces of the windings.

11. In a dynamo electric machine, a r0- tating field magnet providedwith two magnetizing coils per pole, the axes of said coils beingsubstantially radial to the axis of revolution, and the outer edges ofcorrcspending portions of thetwo coils for each pole being at differentdistances from the axis of rotation, and a member for engaging the outersurfaces of the ends of said coils prtwided with a portion engaging onecoil and another portion engaging the second coil. i

12. In a dynamo electric machine, a core, a set of windings thereforcomprising two coils one of which surrounds the other, a fixed supportagainst which. the inner surface of the coils rest, a support engagingthe outer surface of the ends of said coils, and means for securing saidsupports. together con'iprising a bolt or bolts.

13. In a dynoma electric machine, a core, a set of windings thereforincluding a pair of coils arranged one within the other, a pair ofsupports for the ends of said coils, one engaging the inner surfaces ofsaid coils and the other engaging the outer surfaces of said coils, oneof said supports being stationary and the other of said supports beingmovable, and means for clamping the wind ings between said supportscomprising a bolt or bolts which pass between the coils.

1 In a dynamo electric machine, a core, windings therefor, a memberfixed with respect to said coreagainst which the inner surface of endsof said windings rest, separate supporting devices each engaging theexterior surfaces of portions of the ends of said windings, means forsecuring said sup ports together comprising bolts, an annular membersurrounding said outer sup orts and holding them in place, said annu armemher being formed with openings through which said bolts may bewithdrawn.

15. In a dynamo electric machine, a core, a set of windings thereforcomprising two coils one of which surrounds the other, a fixed supportagainst which the inner surfaces of the coils rest, a support engagingthe outer surfaces of the ends of said coils, and means for securingsaid supports together, comprising a bolt or bolts which exing andclamping means of each group being tend between the coils. independentof the spacing and clamping 16. In an alternating current dynamomeans ofthe other group. p a electric machine, a member havin coils, the InWitness whereof, I have hereunto set 5 end turns of which extend beyondeach side my hand this 11th day of October, 1905. 15

of the core of said member, the said coils being divided into a numberof groups or sets, and means for spacing apart and Witnesses:

clamping in relatively fixed position the end BENJAMIN B. HULL, 10 turnsof the coils of each group, the spac- HELEN ORFORD.

WILLIAM FOSTER.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents. Washington, D. C.

